Caenimonas soli sp. nov., isolated from soil

Area of Science:

• Microbiology
• Bacteriology
• Genomics

Background:

• The family Comamonadaceae comprises diverse bacteria with significant roles in various ecosystems.
• Accurate taxonomic classification of novel bacterial isolates is crucial for understanding microbial diversity and function.
• Soil environments harbor a vast, largely uncharacterized microbial population.

Purpose of the Study:

• To characterize a novel bacterial strain, S4^T, isolated from Korean soil.
• To determine the taxonomic placement of strain S4^T within the genus Caenimonas.
• To propose a new species designation for strain S4^T based on comprehensive analyses.

Main Methods:

• Isolation and cultivation of strain S4^T from soil samples.
• Phylogenetic analysis using 16S rRNA gene sequences.
• Chemotaxonomic analysis (respiratory quinones, polar lipids, fatty acids).
• Genomic analysis including DNA G+C content, average nucleotide identity (ANIu), and in silico DNA-DNA hybridization (dDDH).

Main Results:

• Strain S4^T is a non-motile, Gram-negative, rod-shaped bacterium, aerobic, and grows optimally at 25-32°C.
• Phylogenetic analysis placed strain S4^T within the family Comamonadaceae, closely related to Caenimonas terrae and Caenimonas koreensis.
• Genomic data (ANIu 77.6%, dDDH 21% with C. koreensis) and chemotaxonomic profiles supported its distinctiveness.
• The DNA G+C content was determined to be 65.1 mol%.

Conclusions:

• Strain S4^T represents a novel species within the genus Caenimonas.
• The proposed name for this new species is Caenimonas soli sp. nov.
• The type strain is designated as S4^T (KCTC 72742^T = NBRC 114610^T).